All of my SKUs are made to order as purchased online and each SKU is made of selected components. The SKUs are listed with variants, so for example Size 8 (product) is sold in packs of 4 to 15 colours (as variants) and a customer will order a “size 8 6-colour” set. When a customer orders I’d like shopify to deduct the individual components from stock.
How do I do this?